An Antenna for a Mast-Mounted Low Probability of Intercept Continuous Wave Radar: Improving Performance With Digital Architecture

Continuous wave (CW) low probability of intercept (LPI) radars transmit and receive simultaneously, generally using phased-coded waveforms. This article describes a bistatic radar that uses an omnidirectional transmitting antenna and a receiving array with digitally formed simultaneous overlapping beams for search and track. In addition to coherent leakage cancellation to suppress the transmitter leakage at the receiver, a phase-coding technique is used, allowing the antennas to be closely spaced on a common mast. Both of these capabilities are made possible by the digital architecture of the receiving array.